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ADT7518 Datasheet(PDF) 1 Page - Analog Devices |
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ADT7518 Datasheet(HTML) 1 Page - Analog Devices |
1 / 40 page SPI/I2C Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC ADT7518 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Four 8-bit DACs Buffered voltage output Guaranteed monotonic by design over all codes 10-bit temperature-to-digital converter 10-bit 4-channel ADC DC input bandwidth Input range: 0 V to 2.25 V Temperature range: –40°C to +120°C Temperature sensor accuracy of typ: ±0.5°C Supply range: 2.7 V to 5.5 V DAC output range: 0 V to 2 VREF Power-down current: 1 µA Internal 2.25 VREF option Double-buffered input logic Buffered reference input Power-on reset to 0 V DAC output Simultaneous update of outputs (LDAC function) On-chip rail-to-rail output buffer amplifier SPI ®, I2C®, QSPI™, MICROWIRE™, and DSP-compatible 4-wire serial interface SMBus packet error checking (PEC)-compatible 16-lead QSOP package APPLICATIONS Portable battery-powered instruments Personal computers Smart battery chargers Telecommunications systems Electronic text equipment Domestic appliances Process control PIN CONFIGURATION ADT7518 TOP VIEW (Not to Scale) VOUT-B 1 VOUT-C 16 VOUT-A 2 VOUT-D 15 VREF-IN 3 AIN4 14 CS 4 SCL/SCLK 13 GND 5 SDA/DIN 12 VDD 6 DOUT/ADD 11 D+/AIN1 7 INT/INT 10 D–/AIN2 8 LDAC/AIN3 9 Figure 1. GENERAL DESCRIPTION The ADT75181 combines a 10-bit temperature-to-digital converter, a 10-bit 4-channel ADC, and a quad 8-bit DAC, in a 16-lead QSOP package. The part also includes a band gap temperature sensor and a 10-bit ADC to monitor and digitize the temperature reading to a resolution of 0.25°C. The ADT7518 operates from a single 2.7 V to 5.5 V supply. The input voltage range on the ADC channels is 0 V to 2.25 V, and the input bandwidth is dc. The reference for the ADC channels is derived internally. The output voltage of the DAC ranges from 0 V to VDD, with an output voltage settling time of 7 ms typical. The ADT7518 provides two serial interface options: a 4-wire serial interface that is compatible with SPI, QSPI, MICROWIRE, and DSP interface standards, and a 2-wire SMBus/I2C interface. It features a standby mode that is controlled through the serial interface. The reference for the four DACs is derived either internally or from a reference pin. The outputs of all DACs may be updated simultaneously using the software LDAC function or the exter- nal LDAC pin. The ADT7518 incorporates a power-on reset circuit, which ensures that the DAC output powers up to 0 V and remains there until a valid write takes place. The ADT7518’s wide supply voltage range, low supply current, and SPI-/I2C-compatible interface make it ideal for a variety of applications, including personal computers, office equipment, and domestic appliances. It is recommended that new designs use the ADT7519 rather than the ADT7518. The ADT7518’s internal and external temp- erature accuracy spec is only valid when not using the internal reference for the on-chip DAC. The ADT7519 does not have this limitation. 1 Protected by the following U.S. Patent Numbers: 6,169,442; 5,867,012; 5,764174. Other patents pending. |
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